Slab doctor level

Abstract

An instrument for ascertaining whether a surface is horizontal, vertical, or at a 45* angle, consisting essentially of an encased, liquid-filled tube containing an air bubble that moves to a center window when the instrument is set on an even plane. Also called a spirit level. A box level including an elongate body, plumb and level vials, and spaced handholds having outer edges together defining first and second parallel application planes beyond first and second face planes of the elongate body.

Description

FIELD OF THE INVENTION[0001]This invention relates generally to spirit levels and, more particularly, to what are referred to as box levels.BACKGROUND OP THE INVENTION[0002]Box levels of the type to which this invention pertains each include an elongate body which defines vial openings with horizontal & vertical vials secured therein, a pair of spaced hand-hold openings, and in many cases hang openings near the opposite ends of the body to allow the levels to be hung on pegs or other hangers for storage purposes. The elongate bodies are typically of hollow box-like configuration. Such elongate bodies, of course, further define opposed first and second face planes, as well as narrower flat edge surfaces.[0003]Each such box level also includes a pair of hand-holds, often of plastic and / or rubber-like material, lining the two hand-hold openings and secured in such openings to the elongate body. These two hand-holds have outer edges near each of the face planes of the elongate body—ie.,...

AI Technical Summary

Benefits of technology

[0006]Another object of the invention is to provide a sturdy box level with enhanced capability for work surface application.

[0014]Furthermore, with the addition of the permanent, welded 90 degree angle directional 4-way adaptor, one to four sections (box levels) can be coupled to extend the level in 90 degree angles, east, west, north and south. This feature will aid floor covering installers, for example, not only to check slope, grade, etc. in large rooms or areas, but also can aid in layout as well.

Problems solved by technology

When rubber-like hand-holds are used, the level is resistant to slipping that may make surface gauging somewhat problematic.

Given the need in the construction industry for box levels in longer lengths, it has been difficult to manufacture due to transportation and storage problems.

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